Re: Why no Radius anymore?
I think Radius sales were slowing, but I also think Joe sucked all the oxygen out of the room. He's a pretty big talent. You're right there are a lot of sig guitars that have non-signature siblings, but there aren't any RG's with Jem-like qualities like a lion's claw or monkey grip. The Voyager didn't survive Reb Beach's decline, and the features of the Frank Gambale (recessed neck/mounting rings, etc.) didn't survive his departure.
The Radius should have survived Joe's seizure. I don't think it was necessarily intentional, but I would not be surprised if Joe was partially responsible for the lack of a reissue at some point. I would love to see a new Japanese Radius with a 5-piece Prestige neck and an AANJ. Maybe even an Alder or Mahogany body instead of Basswood, but I'm not head of product development for Ibanez.